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FR2721195A1 - Guide for fitting osteotomy plate - Google Patents

Guide for fitting osteotomy plate
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FR2721195A1
FR2721195A1FR9407968AFR9407968AFR2721195A1FR 2721195 A1FR2721195 A1FR 2721195A1FR 9407968 AFR9407968 AFR 9407968AFR 9407968 AFR9407968 AFR 9407968AFR 2721195 A1FR2721195 A1FR 2721195A1
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plate
blade
guide
osteotomy
placing
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FR9407968A
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FR2721195B1 (en
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Jacques Afriat
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Abstract

The guide consists of a support (6) shaped to fit over a predetermined section (7) of a bone, e.g. its external cortical surface. The support is made with an aperture (8) to guide a cutter making a channel for an angled vane on the plate, and slots (9) to guide a cutting instrument such as a saw blade for performing the osteotomy. A fixing screw (10) holds the guide in place against the bone while the channel and saw cuts are being made. The saw blade guide slots are set at an angle to one another to allow a wedge-shaped section to be cut from the bone. The vane on the osteotomy plate is made with a rib of varying height along its under-surface.

Description

Translated fromFrench

L'invention concerne un dispositif de mise en place d'une lameplaque pour la réalisation d'une ostéotomie de réaxation dans une zone osseuse, ladite lame-plaque comportant une lame destinée à être ancrée dans la zone osseuse et une plaque. The invention relates to a device for placing a plate blade for performing a re-axis osteotomy in a bone zone, said plate-blade comprising a blade intended to be anchored in the bone zone and a plate.

Le domaine technique de l'invention est celui des procédés chirurgicaux pour le traitement d'os ou d'articulations, et des dispositifs spécialement adaptés à cet effet. The technical field of the invention is that of surgical methods for the treatment of bones or joints, and devices specially adapted for this purpose.

De tels dispositifs sont utilisés dans le cas d'arthrose débutante du genou qui peut faire l'objet d'une intervention d'ostéotomie de réaxation du genou. Such devices are used in the case of early osteoarthritis of the knee which can be the subject of a knee re-osteotomy intervention.

La déformation genu arum, c'est-à-dire avec arthrose fémoro tibiale interne, est la situation la plus fréquente. Dans ce cas, une ostéotomie de valgisation est nécessaire. The genu arum deformity, that is to say with internal femoro tibial arthritis, is the most frequent situation. In this case, a valgization osteotomy is necessary.

Différentes techniques d'ostéotomie tibiale sont à ce jour pratiquées. L'ostéotomie d'addition interne peut être proposée mais pose plusieurs problèmes, tels que la nécessité d'interposer dans le trait d'ostéotomie un greffon ou un substitut osseux, le délai de consolidation, la nécessité de libérer l'ensemble des parties molles internes, et la situation sous-cutanée de l'ostéotomie. Different techniques of tibial osteotomy are currently practiced. The internal addition osteotomy can be proposed but poses several problems, such as the need to interpose in the osteotomy line a graft or a bone substitute, the consolidation time, the need to release all of the soft parts. internal, and the subcutaneous situation of the osteotomy.

L'ostéotomie de soustraction externe est donc le plus souvent préférée. Pour permettre la correction du varus, une ostéotomie du péroné ou une désarticulation tibio-péronière proximale est nécessaire. The external subtraction osteotomy is therefore most often preferred. To allow correction of the varus, a fibula osteotomy or a proximal tibio-peroneal disarticulation is necessary.

Plusieurs modes d'ostéosvnthèse sont proposés et utilisent par exemple un fixateur externe. une agrafe. une plaque vissée, ou une lame-plaque. Several modes of osteosvnthesis are proposed and use for example an external fixator. a staple. a screwed plate, or a plate blade.

Les lames-plaques ont l'avantage de présenter une bonne solidité qui autorise une mobilisation rapide du genou, et permettent aussi une correction précise de la déformation. The plate-blades have the advantage of having a good solidity which allows rapid mobilization of the knee, and also allows precise correction of the deformation.

On connait un procédé selon lequel une broche-guide est introduite dans l'épiphyse tibiale en s'aidant d'un rapporteur appliqué sur la diaphyse, et faisant donc avec elle un angle connu. A method is known according to which a guide pin is introduced into the tibial epiphysis with the aid of a protractor applied to the diaphysis, and therefore forming a known angle with it.

L'ostéotomie est réalisée en zones métaphysaire, puis on solidarise épiphyse et diaphyse par une lame-plaque d'angulation choisie : la lame tranchante. pointue, est perforée en son centre et suit la direction de la broche-guide. La modification angulaire est donc égale à la différence angle de la broche-guide - angle de la lame-plaque.Par exemple, on corrigera un genu varum de 10" en enfonçant la broche-guide selon un angle de 90 avec la diaphyse puis en ostéosynthèsant l'ostéotomie par une lame-plaque de 100 . On choisit donc avant l'intervention, en s'aidant de calques, l'angle de la broche-guide et celui du matériel de synthèse. en contrôlant par des radiographies peropératoire et par l'appréciation clinique l'exactitude de la correction. The osteotomy is performed in metaphyseal zones, then the epiphysis and diaphysis are joined by a blade-angle plate chosen: the sharp blade. pointed, is perforated in its center and follows the direction of the guide wire. The angular modification is therefore equal to the difference in angle of the guide pin - angle of the plate-plate. For example, we will correct a 10 "genu varum by pushing the guide pin at an angle of 90 with the diaphysis then osteosynthesis of the osteotomy by a plate-slide of 100. We therefore choose before the intervention, using layers, the angle of the guide wire and that of the synthetic material, checking by intraoperative radiographs and by clinical assessment the correctness of the correction.

Le rapporteur utilisé épouse la forme de l'épiphyse tibiale, l'ostéotomie se faisant au niveau de la charnière du rapporteur. Ce dispositif présente l'avantage de permettre la détermination à 2" près de l'angulation entre la broche-guide et la face externe de la diaphyse par exemple. Toutefois. l'utilisation d'un rapporteur pour la mise en place de la broche-guide présente aussi des inconvénients. Par exemple, la visée étant pratiquée par apposition du rapporteur d'angle sur la corticale externe, et la corticale externe n'étant pas parfaitement plane. un positionnement plus distal ou plus proximal du rapporteur d'angle peut induire une erreur de visée. The protractor used follows the shape of the tibial epiphysis, the osteotomy being done at the hinge of the protractor. This device has the advantage of allowing determination at 2 "near the angulation between the guide pin and the external face of the diaphysis for example. However, the use of a protractor for the positioning of the pin -guide also has disadvantages. For example, the aim being practiced by apposition of the angle protractor on the external cortex, and the external cortex not being perfectly flat, a more distal or more proximal positioning of the angle protractor may induce an aiming error.

La demande de brevet FR-A-9.686.012 décrit un dispositif de mise en place de lames-plaques. Ce dispositif comprend un élément-plaque correspondant à la plaque de la lame-plaque et un élément rectiligne correspondant à la lame de la lame-plaque. Le dispositif est réglable et permet de choisir la valeur et le sens de la correction. Lors de l'utilisation, il convient d'appliquer la partie inférieure de l'élément-plaque du dispositif sur la face externe du tibia au-dessous du foyer d'ostéotomie. Ladite face externe n'étant pas parfaitement plane, la position du dispositif de mise en place de la lame-plaque peut également induire une erreur de visée. The patent application FR-A-9,686,012 describes a device for placing blade-plates. This device comprises a plate element corresponding to the plate of the plate blade and a rectilinear element corresponding to the blade of the plate blade. The device is adjustable and allows you to choose the value and direction of the correction. When in use, the lower part of the plate element of the device should be applied to the external face of the tibia below the osteotomy focal point. Said external face not being perfectly flat, the position of the device for placing the plate-blade can also induce a sighting error.

La demande de brevet :R-A-C'.E79.l26 décrit un dispositif pour pratiquer une ostéotomie. Ce dispositif est constitué d'une règle circulaire graduée munie de curseurs pouvant supporter des guidesbroches ou des support de lame de scie, la règle étant reliée à une poutre munie d'un étrier permettant de solidariser l'ensemble du dispositif avec le membre sur lequel on veut pratiquer l'ostéotomie. The patent application: R-A-C'.E79.l26 describes a device for performing an osteotomy. This device consists of a graduated circular rule provided with sliders which can support spindle guides or saw blade supports, the rule being connected to a beam provided with a stirrup making it possible to secure the whole device with the member on which we want to practice osteotomy.

Ce dispositif permet de prélever avec précision un dièdre osseux d'angle au sommet connu.This device makes it possible to precisely take out a bony dihedral of angle at the known vertex.

Toutefois. ce disposait: ne permet pas d'éviter une erreur de visée lors de la mise en place de la broche-guide de la lame-plaque. However. this had: does not avoid an aiming error when the guide pin of the plate-blade is put in place.

Le dispositif précité présente en outre l'inconvénient de ne pas permettre un niveau précis d'introduction de la lame par rapport à l'interligne du genou, ledit niveau nécessitant le plus souvent un contrôle radiographique en cours d'intervention. Cependant, le niveau d'introduction de la lame est un critère essentiel, car le dessin de la lame-plaque épouse la zone osseuse dans laquelle est pratiquée l'ostéotomie, par exemple les reliefs de la corticale métaphysaire externe tibiale. Une mise en place trop haute ou trop basse de la lame entraine un décalage de l'implant, qui se manifeste par la saillie du matériel. The aforementioned device also has the drawback of not allowing a precise level of insertion of the blade relative to the knee spacing, said level most often requiring radiographic control during surgery. However, the level of insertion of the blade is an essential criterion, because the design of the plate-blade follows the bone area in which the osteotomy is performed, for example the reliefs of the tibial external metaphyseal cortex. Too high or too low positioning of the blade leads to an offset of the implant, which is manifested by the protrusion of the material.

La présente invention a pour but de proposer un dispositif de mise en place d'une lame-plaque du type précité, ne présentant pas les inconvénients indiqués ci-dessus, et qui permettent une correction précise d'une désaxation, par exemple de la désaxation en varus du genou. The object of the present invention is to propose a device for fitting a plate-blade of the aforementioned type, which does not have the drawbacks indicated above, and which allow a precise correction of an offset, for example of the offset. in knee varus.

Conformément à l'invention, ce but est atteint du fait que le dispositif de mise en place précité comprend
- un élément apte à épouser à un emplacement prédéterminé ladite zone osseuse par exemple la surface corticale externe,
- ledit élément comportant au moins un premier moyen de guidage apte à guider une broche-guide de ladite lame et,
un second moyen de guidage apte à guider au moins un moyen de découpe constitué par exemple par une lame de scie,
- ledit dispositif comprend en outre un moyen d'immobilisation dudit élément audit emplacement prédéterminé.
According to the invention, this object is achieved due to the fact that the aforementioned positioning device comprises
an element capable of fitting to said predetermined bone area at a predetermined location, for example the external cortical surface,
said element comprising at least a first guide means capable of guiding a guide pin of said blade and,
a second guide means capable of guiding at least one cutting means constituted for example by a saw blade,
- Said device further comprises means for immobilizing said element at said predetermined location.

Le dispositif de mise en place d'une lame-plaque conçue conformément à l'invention présente un certain nombre d'avantages. The device for placing a plate blade designed in accordance with the invention has a certain number of advantages.

Etant donné que l'élément apte à épouser un emplacement prédéterminé de la zone osseuse comporte à la fois un premier moyen de guidage d'une broche-guide et un second moyen de guidage d'un moyen de découpe, le niveau d'introduction et l'angulation de la lame sont déterminés d'une part, et le niveau de l'ostéotomie, sa direction, et la résection cunéiforme sont guidés d'autre part. Par conséquent, la technique chirurgicale de l'ostéotomie, par exemple de l'ostéotomie de valgisation, est rendue plus précise et plus fiable grâce à l'utilisation de l'ancillaire selon l'invention. Given that the element capable of marrying a predetermined location in the bone zone comprises both a first means for guiding a guide pin and a second means for guiding a cutting means, the level of introduction and the angulation of the blade is determined on the one hand, and the level of the osteotomy, its direction, and the wedge resection are guided on the other hand. Consequently, the surgical technique of osteotomy, for example valgisation osteotomy, is made more precise and more reliable thanks to the use of the ancillary device according to the invention.

Les avantageuses dispositions suivantes sont en outre de préférence adoptées
ledit premier moyen de guidage d'une broche-guide coopère avec un logement disposé dans ledit élément muni d'un perçage apte à guider ladite broche-guide et correspondant à une angulation prédéterminée de la lame,
Ledit dispositif comporte un troisième moyen de guidage coopérant avec ledit logement et apte à guider un ciseau défonceur de section similaire à la section de ladite lame,
ledit dispositif comporte au moins trois seconds moyens de guidage aptes à guider ledit moyen de découpe,
ledit second moyen de guidage est constitué par une fente, ledit dispositif comportant par exemple quatre fentes de manière à définir (découper) des coins osseux.
The following advantageous arrangements are also preferably adopted
said first means for guiding a guide pin cooperates with a housing disposed in said element provided with a bore capable of guiding said guide pin and corresponding to a predetermined angulation of the blade,
Said device comprises a third guide means cooperating with said housing and capable of guiding a router chisel of section similar to the section of said blade,
said device comprises at least three second guide means capable of guiding said cutting means,
said second guide means is constituted by a slot, said device comprising for example four slots so as to define (cut) bone corners.

ledit élément apte à épouser ladite zone osseuse est sensiblement en forme de plaque, et lesdits premier et second moyens de guidage sont sensiblement en forme de blocs,
ledit moyen d'immobilisation est constitué par un moyen de fixation à ladite zone osseuse, par exemple une vis.
said element capable of marrying said bone area is substantially in the form of a plate, and said first and second guide means are substantially in the form of blocks,
said immobilization means is constituted by a means of attachment to said bone area, for example a screw.

L'instrumentation offre la possibilité de décider l'angulation de la broche guide (et donc de la lame) par rapport à la corticale externe du tibia. Elle permet aussi de pratiquer I'ostéotomie de soustraction externe avec les avantages suivants : le siège de cette ostéotomie ainsi que sa direction sont donnés par l'instrumentation, ce qui permet de préserver un pont osseux suffisant entre la lame et l'ostéotomie. En outre, les deux traits d'ostéotomie vont permettre la résection d'un coin externe avec l'angulation donnée par l'écartement des fentes. Par ailleurs ces deux traits d'ostéotomie se rejoignent à proximité de la corticale interne, ce qui permet de la préserver au mieux pour pouvoir garder une charnière interne. The instrumentation offers the possibility of deciding the angulation of the guide pin (and therefore of the blade) in relation to the external cortex of the tibia. It also makes it possible to practice the external subtraction osteotomy with the following advantages: the seat of this osteotomy as well as its direction are given by the instrumentation, which makes it possible to preserve a sufficient bone bridge between the blade and the osteotomy. In addition, the two osteotomy lines will allow the resection of an external corner with the angulation given by the spacing of the slots. In addition, these two osteotomy lines meet near the internal cortex, which makes it possible to preserve it as best as possible in order to be able to keep an internal hinge.

En effet. il n'est pas nécessaire de pratiquer l'ostéotomie complète du tibia y compris la corticale interne. L'idéal est en effet d'obtenir la simple fragillsation de celle-ci. près résection du coin externe, on arrive à faire plier cette corticale interne, ce qui rend le montage très solide. puisqu'il existe un pont osseux interne, et une bonne ostéosynthèse externe. Indeed. it is not necessary to perform a complete osteotomy of the tibia including the internal cortex. The ideal is indeed to obtain the simple fragillation thereof. After resection of the external corner, we manage to bend this internal cortex, which makes the assembly very solid. since there is an internal bone bridge, and good external osteosynthesis.

La présente invention vise non seulement la nouvelle structure d'un dispositif de mise an plaque d'une lame-plaque, mais également une lame-plaque apte à être utilisée avec ledit dispositif de mise en place, ladite lame comportant un canal central coopérant avec la broche-guide et comportant en outre une nervure centrale. The present invention relates not only to the new structure of a device for setting a plate to a plate blade, but also to a plate blade suitable for use with said positioning device, said blade comprising a central channel cooperating with the guide pin and further comprising a central rib.

Concernant ladite lame-plaque, les avantageuses dispositions suivantes sont en outre et de préférence adoptées
ladite nervure est disposée en partie inférieure de la lame
ladite nervure a une section sensiblement triangulaire
la hauteur de ladite nervure augmente régulièrement depuis l'extrémité libre de la lame vers la plaque.
With regard to said plate-blade, the following advantageous arrangements are in addition and preferably adopted
said rib is arranged in the lower part of the blade
said rib has a substantially triangular section
the height of said rib increases regularly from the free end of the blade towards the plate.

Etant donné que ladite nervure est centrale, il est permis de ménager un encombrement suffisant pour l'usinage d'une perforation centrale destinée à recevoir la broche-guide, sans compromettre la solidité de la lame-plaque et en s'opposant à la force de torsion imprimée à la lame-plaque, de manière à augmenter la tenue de ladite lame-plaque. Since said rib is central, it is possible to provide sufficient space for the machining of a central perforation intended to receive the guide pin, without compromising the solidity of the plate-blade and by opposing the force of torsion imprinted on the plate-plate, so as to increase the holding of said plate-plate.

En outre, la lame-plaque selon l'invention présente un encombrement réduit par rapport à une lame-plaque de type connu dite en col de cygne. In addition, the plate-blade according to the invention has a reduced bulk compared to a plate-blade of known type known as swan neck.

Enfin, par rapport à d'autres lames-plaques de type connu, la lame-plaque selon l'invention présente l'avantage de ne pas comporter de renforts orientés vers le haut qui peuvent être agressifs si la lame-plaque est posée près de l'interligne du genou. Finally, compared to other plate-blades of known type, the plate-blade according to the invention has the advantage of not having upward-facing reinforcements which can be aggressive if the plate-blade is placed near the knee joint space.

L'invention sera mieux conlprXse et d'autres caractéristiques et leurs avantages apparaitront à la lecture de la description des modes de réalisation donnés ci-après à titre d'exemple. The invention will be better understood and other characteristics and their advantages will appear on reading the description of the embodiments given below by way of example.

Il sera fait préférence aux dessins annexés dans lesquels
la figure 1 est une coupe selon la ligne I-I de la figure 3 illustrant un mode de réalisation préférentiel du dispositif de mise en place d'une lame-plaque selon l invention ;
la figure 2 est une coupe illustrant une ostéotomie de soustraction externe à l'aide d'une lame-plaque
la figure 3 est une vue de coté d'un mode de réalisation préférentiel du dispositif de mise en place d'une lame-plaque de l'invention ;;
la figure 4 est une vue en perspective illustrant un premier moyen de guidage apte à guider une broche-guide
la figure 5 est une vue en perspective illustrant un troisième moyen de guidage apte à guider un ciseau défonceur
la figure 6 est une vue de côté illustrant une lame-plaque apte à être utilisée avec un dispositif de mise en place selon l'invention ;
la figure 7 est une coupe transversale selon la ligne VII-VII de la figure 6.
Preference will be given to the accompanying drawings in which
Figure 1 is a section along line II of Figure 3 illustrating a preferred embodiment of the device for installing a plate blade according to the invention;
FIG. 2 is a section illustrating an external subtraction osteotomy using a plate slide
Figure 3 is a side view of a preferred embodiment of the device for installing a plate blade of the invention;
Figure 4 is a perspective view illustrating a first guide means capable of guiding a guide pin
Figure 5 is a perspective view illustrating a third guide means capable of guiding a hammer chisel
Figure 6 is a side view illustrating a plate-blade adapted to be used with a positioning device according to the invention;
FIG. 7 is a cross section along the line VII-VII of FIG. 6.

On se réfère d'abord aux ligures 1 à 3 des dessins ; le dispositif de mise en place 1 d'une lame-plaque 2 (représentée figure 2) comporte un élément 6 apte à épouser une zone osseuse 3, par exemple la région externe 30 du tibia 31 proximale. L'élément 6 est sensiblement en forme de plaque 1. L'élément 6 est solidarisé au tibia par un moyen d'immobilisation 10 constitué par un moyen de fixation, par exemple une vis unicorticale. L'élément 6 présente dans sa partie proximale un logement 11, notamment un évidement parallélépipédique, qui permet la mise en place d'un premier moyen de guidage 8 d'une broche-guide constituant un bloc de visée. First, reference is made to Figures 1 to 3 of the drawings; the device 1 for placing a plate-blade 2 (shown in FIG. 2) comprises an element 6 capable of matching a bone area 3, for example the external region 30 of the proximal tibia 31. The element 6 is substantially in the form of a plate 1. The element 6 is secured to the tibia by an immobilizing means 10 constituted by a fixing means, for example a unicortical screw. The element 6 has in its proximal part a housing 11, in particular a parallelepiped recess, which allows the establishment of a first guide means 8 of a guide pin constituting an aiming block.

Préférentiellement, trois blocs de visée 8 sont disponibles selon l'angulation qu'ils déterminent par rapport à la corticale externe 7. Preferably, three aiming blocks 8 are available according to the angulation they determine relative to the external cortex 7.

Préférentiellement, l'angulation qui permet d'obtenir un trajet parallèle à l'interligne du genou est choisi sur des radiographies préopératoires.Preferably, the angulation which makes it possible to obtain a path parallel to the knee spacing is chosen on preoperative radiographs.

Une vis de blocage 17 maintien le bloc de visée 8 au premier moyen de guidage dans le logement 11 de l'élément 6. A locking screw 17 holds the aiming block 8 to the first guide means in the housing 11 of the element 6.

D'autres caractéristiques du dispositif de mise en place selon l'invention apparaitront à la lecture de la description d'un procédé d'utilisation du dispositif de mise en place selon l'invention donnée ci-après à titre d'exemple. Other characteristics of the positioning device according to the invention will appear on reading the description of a method of using the positioning device according to the invention given below by way of example.

Ledit élément 6 est disposé de manière à épouser un emplacement prédéterminé 7. 30 de ladite zone osseuse 3, par exemple la surface corticale externe. Said element 6 is arranged so as to conform to a predetermined location 7. 30 of said bone zone 3, for example the external cortical surface.

Un premier moyen de guidage 8 tel que décrit ci-dessus est ensuite disposé dans le logement ll de l'élément 8. A first guide means 8 as described above is then placed in the housing 11 of the element 8.

Le bloc de visée 8 représenté figure 4 est parallélépipédique et percé de part en part d'un passage 12 tubulaire (cylindrique) de section adaptée pour recevoir une broche-guide, et de deux canons 18 de perçage, parallèles entre eux et audit passage 12. The sighting block 8 shown in FIG. 4 is parallelepipedal and pierced right through a tubular (cylindrical) passage 12 of cross section adapted to receive a guide pin, and two drilling cannons 18, parallel to each other and to said passage 12 .

Une broche-guide 1-,, par exemple de section 22/10 de millimètres est poussée jusqu'à la colt crie interne à l'aide d'un passage 12 dont est muni le bloc de visée 8. A guide pin 1- ,, for example of section 22/10 of millimeters is pushed to the internal Cree colt by means of a passage 12 with which the aiming block 8 is provided.

On perfore à l'aide par exemple d'une mèche de 3,2 mm la métaphyse tibiale selon deux trajets parallèles à l'aide des canons de perçage 18 de manière à préparer l'introduction de la lame-plaque 2. The tibial metaphysis is pierced using, for example, a 3.2 mm drill bit along two parallel paths using the piercing barrels 18 so as to prepare the introduction of the plate-blade 2.

Le premier moyen de guidage 8 est alors remplacé par le troisième moyen de guidage 13 représenté figure 5 constituant un bloc de visée d'angulation correspondant qui est percé d'un orifice 32 permettant le passage d'un ciseau défonceur. The first guide means 8 is then replaced by the third guide means 13 shown in Figure 5 constituting a corresponding angle aiming block which is pierced with an orifice 32 allowing the passage of a hammer chisel.

Un ciseau défonceur (non représenté) est alors impacté jusqu'à la mensuration désirée. Dans le cas de l'utilisation d'une lame-plaque selon la figure 6. le ciseau défonceur est sensiblement impacté jusqu'aux 2/3 de la mensuration désirée. A hammer chisel (not shown) is then impacted until the desired measurement. In the case of the use of a plate-blade according to FIG. 6. the hammer chisel is substantially impacted up to 2/3 of the desired measurement.

Une scie oscillante (non représentée) est alors introduite dans un des second moyens de guidage 9 qui constituent des fentes d'ostéotomie et qui sont prévues sur l'élément 6 et s'étendent parallèlement à des plans ayant une droite d'intersection commune. Deux traits d'ostéotomie sont alors pratiqués pour une correction de 5 , la résection cunéiforme utilisera deux fentes 9 successives. An oscillating saw (not shown) is then introduced into one of the second guide means 9 which constitute osteotomy slots and which are provided on the element 6 and extend parallel to planes having a common line of intersection. Two osteotomy lines are then performed for a correction of 5, the wedge resection will use two successive slits 9.

Le troisième moyen de guidage 13 (voir figure 5) est ensuite retiré ainsi que l'élément 6, la broche-guide 15 étant laissée en place. The third guide means 13 (see Figure 5) is then removed as well as the element 6, the guide pin 15 being left in place.

L'ostéotomie est ensuite complétée en arrière de manière à permettre l'ablation du coin osseux externe. The osteotomy is then completed behind to allow the external bony wedge to be removed.

La lame-plaque 2 (figures 2 et 6) est alors introduite sur la broche-guide 15 (grâce au canal 14 figure 7 dont elle est munie) et le tibia est ramené jusqu'au contact de la plaque 5 de manière à opérer une correction automatique. The plate blade 2 (FIGS. 2 and 6) is then introduced onto the guide pin 15 (thanks to the channel 14 in FIG. 7 with which it is provided) and the tibia is brought back up to contact with the plate 5 so as to operate a autocorrect.

On procède enfin au vissage de la plaque 5, par exemple à l'aide de trois vis 19 (figure 2
Préférentiellement, deux longueurs de lame 4 égales respectivement à 5,5 centimètres et 6.3 centimètres, seront disponibles pour cinq angulations, respectivement à 07'. 90 , 95", 100 , et 105", de manière à obtenir des corrections de 5.10 et 15" quel que soit l'angle de visée choisi.
Finally, the plate 5 is screwed, for example using three screws 19 (FIG. 2
Preferably, two blade lengths 4 equal to 5.5 centimeters and 6.3 centimeters respectively, will be available for five angles, respectively at 07 '. 90, 95 ", 100, and 105", so as to obtain corrections of 5.10 and 15 "whatever the angle of sight chosen.

Alternativement, deux blocs de visée 8 supplémentaires peuvent être disponibles (82,5 et 31. 7'), de manière à permettre des corrections de 2,7', entre D et 17'. Alternatively, two additional aiming blocks 8 may be available (82.5 and 31. 7 '), so as to allow corrections of 2.7', between D and 17 '.

L'élément 6 est disponible dans trois tailles (petit, moyen et grand modèles) de manière à s'adapter à différentes tailles de tibias. Element 6 is available in three sizes (small, medium and large) to accommodate different shin sizes.

Un calque pré-opératoire de l'élément 6 est utilisé, de manière à choisir sur la radiographie du genou l'élément 6 dont la taille se rapproche le plus du tibia.A pre-operative layer of element 6 is used, so as to choose on the radiography of the knee element 6 whose size is closest to the tibia.

L'utilisation d'un élément Ó non conforme, par exemple à la suite d'une erreur de choix de l'opérateur, n'induira pas d'erreur dans la correction mais simplement un positionnement trop haut ou trop bas de l'implant 2 et de l'ostéotomie. En conséquence, le dispositif de mise en place 1 selon l'invention garantit toujours la précision de la correction. La possibilité de choisir entre trois tailles d'éléments 6 permet simplement d'augmenter la précision dans le positionnement de la lame-plaque 2 et de l'ostéotomie. The use of a non-conforming element Ó, for example following an operator's choice error, will not cause an error in the correction but simply a positioning too high or too low of the implant 2 and osteotomy. Consequently, the positioning device 1 according to the invention always guarantees the accuracy of the correction. The possibility of choosing between three sizes of elements 6 simply increases the precision in the positioning of the plate-blade 2 and of the osteotomy.

On se réfère maintenant aux figures 6 et 7 des dessins ; la lameplaque 2 qui y est représentée, est prévue pour le montage de 1'ostéotomie tibiale, et est conçue pour être guidée par une brocheguide 15, par exemple de diamètre de 20/10 de millimètres, coopérant avec un canal 4 de guidage prévu dans ladite lame-plaque 2. Referring now to Figures 6 and 7 of the drawings; the plate blade 2 which is shown there, is intended for mounting the tibial osteotomy, and is designed to be guided by a guide pin 15, for example with a diameter of 20/10 millimeters, cooperating with a guide channel 4 provided in said plate-blade 2.

Telle que représentée, la lame 4 présente une nervure de renfort 16 de la lame 4, prévue dans la partie centrale inférieure de celleci, de section triangulaire, et dont la hauteur augmente depuis l'extrémité libre 33 de la lame 4 vers son autre extrémité qui est au contact de la plaque 5. La nervure de renfort 16 est conçue de manière à s'opposer aux forces de flexion qui résultent de la mise en charge du membre opéré. As shown, the blade 4 has a reinforcing rib 16 of the blade 4, provided in the lower central part of the latter, of triangular section, and whose height increases from the free end 33 of the blade 4 to its other end. which is in contact with the plate 5. The reinforcing rib 16 is designed so as to oppose the bending forces which result from the loading of the operated limb.

Un mode de réalisation prévoit non pas deux perçages latéraux 18 (voir figure 4) du bloc 8 mais quatre ou six trous latéraux 18. One embodiment provides not two side holes 18 (see FIG. 4) of the block 8 but four or six side holes 18.

Bien qu'on ait décrit le dispositif de mise en place selon l'invention dans son application à une ostéotomie de soustraction externe, il faut noter que l'invention a des applications plus générales. Un dispositif de mise an place d'une lame-plaque selon l'invention peut être utilisé par exemple dans les cas suivants : une ostéotomie d'impaction externe ou une ostéotomie d'addition interne (ostéotomie de valgisation tibiale), une ostéotomie d'ouverture externe ou de fermeture interne (ostéotomie de varisation de siège supra-condylien). Although the positioning device according to the invention has been described in its application to an external subtraction osteotomy, it should be noted that the invention has more general applications. A device for placing a blade-plate according to the invention can be used for example in the following cases: an external impaction osteotomy or an internal addition osteotomy (tibial valorisation osteotomy), an osteotomy of external opening or internal closing (osteotomy of supracondylar seat variation).

Claims (11)

Translated fromFrench
EEVENDICATIONSEVENTS 1. Dispositif de mise en place (1) d'une lame-plaque (2) pour la réalisation d'une ostéotomie de réaxation dans une zone osseuse (3), ladite lame-plaque (2) comportant une lame (4) destinée à être amenée dans ladite zone osseuse (3) et une plaque (5) , caractérisé en ce qu'il comprend 1. Device for placing (1) a plate-blade (2) for carrying out a re-axis osteotomy in a bone area (3), said plate-plate (2) comprising a blade (4) intended to be brought into said bone area (3) and a plate (5), characterized in that it comprises - un élément (6) apte à épouser à un emplacement prédéterminé (7) ladite zone osseuse (3), par exemple la surface corticale externe, an element (6) capable of fitting to said predetermined location (7) at a predetermined location (7), for example the external cortical surface, - ledit élément comportant un premier moyen de guidage (8) apte à guider une broche-guide de ladite lame (4) et, said element comprising a first guide means (8) capable of guiding a guide pin of said blade (4) and, - au moins un second moyen de guidage (9) apte à guider au moins un moyen de découpe constitué par exemple par une lame de scie, at least one second guide means (9) capable of guiding at least one cutting means constituted for example by a saw blade, - ledit dispositif comprenant en outre au moins un moyen d'immobilisation (10) dudit élément audit emplacement prédéterminé (7). - Said device further comprising at least one immobilization means (10) of said element at said predetermined location (7). 2. Dispositif de mise an place (1) d'une lame-plaque (2) selon la revendication 1, caractérisé en ce que ledit premier moyen de guidage (8) d'une broche-guide coopère avec un logement (11) disposé dans ledit élément (6) et est muni d'un perçage (12) apte à guider ladite broche-guide et correspondant à une angulation prédéterminée de la lame (4). 2. Device for placing in place (1) a blade-plate (2) according to claim 1, characterized in that said first guide means (8) of a guide pin cooperates with a housing (11) disposed in said element (6) and is provided with a bore (12) capable of guiding said guide pin and corresponding to a predetermined angulation of the blade (4). 3. Dispositif de mise en place d'une lame-plaque selon l'une quelconque des revendications l ou 2, caractérisé en ce qu'il comporte un troisième moyen de guidage 13) coopérant avec ledit logement (11) et apte à guider un ciseau 4éfonceur de section similaire à la section de ladite lame. 3. Device for placing a plate-blade according to any one of claims l or 2, characterized in that it comprises a third guide means 13) cooperating with said housing (11) and capable of guiding a 4-shank chisel of section similar to the section of said blade. 4. Dispositif de muse en place d'une lame-plaque selon l'une quelconque des revendications 1 à 3 caractérisé en ce qu il comporte au moins trois second moyens de guidage (9) aptes à guider ledit moyen de découpe. 4. Muse device in place of a plate blade according to any one of claims 1 to 3 characterized in that it comprises at least three second guide means (9) capable of guiding said cutting means. 5. Dispositif de mise en place d'une lame-plaque selon l'une quelconque des revendications là . caractérisé en ce que ledit second moyen de guidage (9) est constitué par une fente, ledit dispositif comportant par exemple quatre fentes (9) de manière à définir des coins osseux. 5. Device for placing a plate-blade according to any one of the claims there. characterized in that said second guide means (9) consists of a slot, said device comprising for example four slots (9) so as to define bony corners. 6. Dispositif de mise en place d'une lame-plaque selon l'une quelconque des revendications f à 5. caractérisé en ce que ledit élément (6) apte à épouser ladite zone osseuse (3) est sensiblement en forme de plaque, et lesdits premier (8) et second (9) moyens de guidage sont sensiblement en forme de blocs. 6. Device for placing a plate-blade according to any one of claims f to 5. characterized in that said element (6) able to match said bone area (3) is substantially in the form of a plate, and said first (8) and second (9) guide means are substantially in the form of blocks. 7. Dispositif de mise en place d'une lame-plaque selon l'une quelconque des revendications 1 à 6, caractérisé en ce que ledit moyen d'immobilisation (10) est constitué par un moyen de fixation à ladite zone osseuse (3), par exemple une vis. 7. Device for placing a plate-blade according to any one of claims 1 to 6, characterized in that said immobilization means (10) is constituted by a means of attachment to said bone area (3) , for example a screw. 8. Lame-plaque (2) apte à être utilisée avec un dispositif de mise en place (1) selon l'une quelconque des revendications 1 à 7, ladite lame (4) comportant n canal central (14) coopérant avec ladite broche-guide (15), caractérisée en ce que ladite lame (4) comporte une nervure centrale (16). 8. Plate blade (2) suitable for use with a positioning device (1) according to any one of claims 1 to 7, said blade (4) comprising n central channel (14) cooperating with said spindle- guide (15), characterized in that said blade (4) has a central rib (16). 9. Lame-plaque selon la revendication 8, caractérisée en ce que ladite nervure (16) est disposée en partie inférieure de la lame (4). 9. Plate-blade according to claim 8, characterized in that said rib (16) is disposed in the lower part of the blade (4). 10. Lame-plaque selon l'une quelconque des revendications 8 et 9, caractérisé en ce que ladite nervure (16) a une section sensiblement triangulaire. 10. Plate-blade according to any one of claims 8 and 9, characterized in that said rib (16) has a substantially triangular section. 11. Lame-plaque selon l une quelconque des revendications 8 à 10, caractérisée en ce que la hauteur de ladite nervure (16) augmente régulièrement depuis l'extrémité libre de la lame (4) vers la plaque (5). 11. Plate-blade according to any one of claims 8 to 10, characterized in that the height of said rib (16) increases regularly from the free end of the blade (4) towards the plate (5).
FR9407968A1994-06-211994-06-21 Device for placing a plate-blade for performing a re-orientation osteotomy in a bone area.Expired - Fee RelatedFR2721195B1 (en)

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